Wow! I had the same thing happened to me last weekend! First time ever. I was on my way to visit Magnus580 and it started in the neighborhood at home.
I started to panic and look around like "oh this is not good. I had just pulled up to my dad's house and thought I would give him a little blast on the horn to have him come out so we could get going. Well there I sat with the horn blaring. I just turned the truck off and let the tanks run out. It only seemed like an hour or two. It was actually pretty funny now that I think about it because me dad came out of the house and really gave it to me. "What the hell is the big hurry??!!"
He thought I was laying on the horn to make him hurry! Hahaha. It was pretty funny. He must have thought my butt was on fire or something. Haha.
Well it finally stops and away we go. On the way to Magnus's house it went off a couple times but just for a few seconds. I get to Magnus's house we do our thing and I'm ready to leave. I'm parked about 25 feet from his house. The house that his two little boys just started their nap in. Guess what? Uncle Lax just woke up the whole world with his magic horn as I start to pull away. I'm just looking at Magnus and laughing with both hands in the air as proof I was not blowing the horn. He looks at me like I must be the Titanic pulling away from port with all horns blaring. (Sorry Mike)
He must have thought I was nuts driving down the road with the horn going on and off like I was in the Rose Bowl parade. What can I say? My horn...blows.